Influence of tooth pitting on time-varying mesh stiffness and vibration response of a spur gear pair

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (16) : 278-286.

HOU Jingyu1, YANG Shaopu2, LIU Yongqiang3

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Abstract

As one of the most common faults in gear transmission, tooth pitting will directly affect the time-varying meshing stiffness (TVMS) of the gear pair, and then leads to the change of dynamic characteristics of system. Thus, each pitting shape is considered as approximately a part of ellipse cylinder, and three damage levels are defined based on the position and number of pits: slight pitting, moderate pitting and severe pitting. The TVMS of perfect gear and that of gear with different pitting severity levels are calculated, and the effect of the position and size of pits on TVMS is discussed by use of the potential energy method. The fault dynamic response of one-stage spur gear transmission is studied and the results are qualitatively verified by the Drivetrain Dynamics Simulator (DDS). The results show that the model presented in this study can better match with the actual situation. With the increase of positional parameter, the pitted area moves gradually from the base circle to the top land. The longer the length of the major axis is, the more obvious the reduction of the TVMS in the pitted area is. While with the change of length of the minor axis, the reduction of the TVMS caused by different levels of pitting damages is basically identical in the same range of the angular displacement of the driving gear. The established model is capable of predicting the TVMS and vibration characteristics of a pitted gear system, and the corresponding vibration analysis results could provide theoretical reference for the detection and diagnosis of tooth pitting.

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spur gear / tooth pitting / time-varying meshing stiffness / dynamic response / frequency spectrum analysis

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HOU Jingyu1, YANG Shaopu2, LIU Yongqiang3. Influence of tooth pitting on time-varying mesh stiffness and vibration response of a spur gear pair[J]. Journal of Vibration and Shock, 2024, 43(16): 278-286

References

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